mm/vmalloc: update __vmalloc_node_range() documentation

__vmalloc() now supports non-blocking flags such as GFP_ATOMIC and
GFP_NOWAIT.  Update the documentation accordingly.

Link: https://lkml.kernel.org/r/20251007122035.56347-10-urezki@gmail.com
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Marco Elver <elver@google.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d7e7049e01f8ff7d6b627dd72730204bb4942096..9a63c91c6150ddb27e3cdfb2d0a5e1f7a4210513 100644 (file)
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -3881,19 +3881,20 @@ fail:
  * @caller:              caller's return address
  *
  * Allocate enough pages to cover @size from the page level
- * allocator with @gfp_mask flags. Please note that the full set of gfp
- * flags are not supported. GFP_KERNEL, GFP_NOFS and GFP_NOIO are all
- * supported.
- * Zone modifiers are not supported. From the reclaim modifiers
- * __GFP_DIRECT_RECLAIM is required (aka GFP_NOWAIT is not supported)
- * and only __GFP_NOFAIL is supported (i.e. __GFP_NORETRY and
- * __GFP_RETRY_MAYFAIL are not supported).
+ * allocator with @gfp_mask flags and map them into contiguous
+ * virtual range with protection @prot.
  *
- * __GFP_NOWARN can be used to suppress failures messages.
+ * Supported GFP classes: %GFP_KERNEL, %GFP_ATOMIC, %GFP_NOWAIT,
+ * %GFP_NOFS and %GFP_NOIO. Zone modifiers are not supported.
+ * Please note %GFP_ATOMIC and %GFP_NOWAIT are supported only
+ * by __vmalloc().
  *
- * Map them into contiguous kernel virtual space, using a pagetable
- * protection of @prot.
+ * Retry modifiers: only %__GFP_NOFAIL is supported; %__GFP_NORETRY
+ * and %__GFP_RETRY_MAYFAIL are not supported.
  *
+ * %__GFP_NOWARN can be used to suppress failure messages.
+ *
+ * Can not be called from interrupt nor NMI contexts.
  * Return: the address of the area or %NULL on failure
  */
 void *__vmalloc_node_range_noprof(unsigned long size, unsigned long align,